/Engine/Source/Runtime/Core/Public/Serialization/MemoryImage.h
Merging duplicate sections will make the resulting memory image smaller. This will only work for data that is expected to be read-only after freezing. Merging sections will break any manual fix-ups applied to the frozen data
void Flatten ( [FMemoryImageResult](API\Runtime\Core\Serialization\FMemoryImageResult) & OutResult, bool bMergeDuplicateSections )